<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>demo</title>
    <style>
        * {
            box-sizing: border-box;
        }

        html,
        body {
            margin: 0;
            padding: 0;
        }

        nav {
            width: 100%;
            height: 40px;
            background-color: black;
            color: white;
            font-weight: bold;
        }

        nav ul {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        nav ul li {
            text-align: center;
            width: 100%;
            line-height: 40px;
            list-style: none;
        }

        nav ul li:nth-of-type(1) {
            background-color: #f0f0f0;
            color: black;
        }

        nav ul li:hover {
            background-color: #f0f0f0;
            color: black;
        }

        main {
            width: 100%;
            height: 100%;
            display: flex;
        }

        .left {
            width: 50%;
            height: 100%;
        }

        ul {
            list-style: none
        }

        ul li {
            background-color: lightseagreen;
            width: 200px;
            height: 50px;
            border-radius: 5px;
            margin-top: 10px;
            text-align: center;
            line-height: 50px;
            color: white;
        }
        footer{
            height: 30px;
            line-height: 30px;
            background-color: limegreen;
        }
        footer a{
            text-decoration: none;
            color: white;
            margin-left: 30px;
        }
    </style>
</head>

<body>
    <nav>
        <ul>
            <li>HOME</li>
            <li>ABOUT</li>
            <li>CONTACT</li>
            <li>LINK</li>
        </ul>
    </nav>
    <main>
        <div class="left">
            <ul>
                <li>叶冰洁</li>
                <li>周楠</li>
                <li>徐地</li>
                <li>林炜城</li>
                <li>赵老师</li>
            </ul>
        </div>
        <div class="right">
            <ul>
                <li>叶冰洁</li>
                <li>周楠</li>
                <li>徐地</li>
                <li>林炜城</li>
                <li>赵老师</li>
            </ul>
        </div>
    </main>
    <footer>
        <a href="https://www.baidu.com/">百度</a>
        <a href="https://www.taobao.com/">淘宝</a>
        <a href="https://www.sina.com.cn/">新浪</a>
        <a href="https://www.jd.com/">京东</a>
        <a href="https://www.douyu.com/">斗鱼</a>
    </footer>
</body>

</html>